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path: root/src/backend/optimizer/prep/prepunion.c
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-rw-r--r--src/backend/optimizer/prep/prepunion.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 2214920dea4..043181b586b 100644
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -675,7 +675,7 @@ generate_union_paths(SetOperationStmt *op, PlannerInfo *root,
if (enable_parallel_append)
{
parallel_workers = Max(parallel_workers,
- fls(list_length(partial_pathlist)));
+ pg_leftmost_one_pos32(list_length(partial_pathlist)) + 1);
parallel_workers = Min(parallel_workers,
max_parallel_workers_per_gather);
}